React Hooks Tutorial 27 | useMemo Hook | English
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The useCallback hook in React is used to memoize callback functions. This can be useful for optimizing performance, especially in components that are re-rendered frequently or when passing callbacks to child components that rely on referential equality to prevent unnecessary re-renders.
Important Considerations
Dependency Array: The dependencies array is crucial. If you forget to include a dependency, the callback might not update when expected. Conversely, including unnecessary dependencies can prevent effective memoization.
Overuse: Overusing useCallback can lead to unnecessary complexity without significant performance benefits. Use it judiciously in scenarios where it provides a clear performance improvement.
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0:00 Introduction
0:40 Example
3:06 Performance
9:00 React Memo